Display screen or portion thereof having a graphical user interface with a route tracking tool



The sole FIGURE is an embodiment of a display screen or portion thereof having a graphical user interface with a route tracking tool showing my new design.

The outermost broken lines depict the display screen or portion thereof in which the design is embodied that form no part of the claimed design. The remaining broken lines illustrate portions of the graphical user interface that form no part of the claim design. 

CLAIM The ornamental design for a display screen or portion thereof having a graphical user interface with a route tracking tool, as shown and described. 